[Effects of core binding factor alpha1 on promotion of osteoblastic differentiation from marrow mesenchymal stem cells].

OBJECTIVE: To observe effects of the core binding factor alpha1 (Cbfalpha1) in its promoting differentiation of the rabbit marrow mesenchymal stem cells (MSCs) into osteoblasts.

METHODS: The rabbit marrow MSCs were isolated and cultured in vitro and were divided into 3 groups. In the control group, the marrow MSCs were cultured by DMEM; in the single inducement group, they were cultured by the condition medium (DMEM, 10% fetal bovine serum, dexamethasone 10 mmol/L, vitamin C 50 mg/L, and beta-GP 10 mmol/L); and in the experimental group, they were transfected with AdEasyl/Cbfalpha1, and then were cultured by the condition medium. The alkaline phosphatase (ALP) activity and the expression of osteocalcin as the osteoblast markers were measured with the chemohistological and immunohistochemical methods at 3 days, 1, 2, 3, and 4 weeks after inducement.

RESULTS: More than 90% MSCs were grown well in vitro. The GFP was positive in MSCs after their being transfected with AdEasyl/Cbfalpha1. The ALP activity and the expression of osteocalcin were significantly upregulated in the transfection group compared with those in the single inducement group and the control group at 1, 2, 3, and 4 weeks (P < 0.05). The mineralized node began to appear at 2 weeks in the experimental group and the single induction group, but did not appear in control group.

CONCLUSION: Cbfalpha1 can obviously promote differentiation of the rabbit marrow mesenchymal stem cells into the osteoblasts.